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Definition: modular chassis

A hardware device that is designed for expansion and accepts a variety of plug-in modules of different types. High-end network switches and routers are often built with a modular chassis. See line card.

A Modular Chassis
Cabletron's earlier MMAC PLUS was a network hub that supported Ethernet, Token Ring, FDDI and ATM networks. The boards plugged into the backplane, which was a bridge between the various topologies. (Image courtesy of Cabletron Systems.)